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Real estate (Details 4) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Real Estate [Abstract]        
Revenues $ 872 $ 3,037 $ 2,810 $ 7,939
Total expenses (769) (2,464) (1,799) (5,459)
Impairment of assets (427) (1,346) (395) (16,620)
Income (loss) from discontinued operations $ (324) $ (773) $ 616 $ (14,140)